High-power DPSS laser hosted on a HMW-THS

Maurizio Checchetti

doi:10.1117/12.705244

20 February 2007 High-power DPSS Laser hosted on a HMW-THS

Maurizio Checchetti

Proceedings Volume 6451, Solid State Lasers XVI: Technology and Devices; 64511F (2007) https://doi.org/10.1117/12.705244
Event: Lasers and Applications in Science and Engineering, 2007, San Jose, California, United States

Abstract

The Hollow Metallic Winglets / HMW-THS, a turbo engine optimised for cooling electronics, handles large flows of energy, gas and air. Its heat exchanging shell, of huge area, tops the pressurised Can; the bottom fits a window. The hosted machine is built around a large inner gas distributor which integrates the main athermal structures. Considering the power levels, the ducting ease of both outer air-flows is as important and cuts noise. Two banks of hybrid mounted Laser Diodes / LDs, side or end feed each lasing Z-slab, thin and exposed to the cooling gas, which flows fast on both sides. The least path to reach the cooling gas minimises dT; to further reduce the thermal lensing effects, the local cooling can be tailored / spoiled to copy the heating density. The simplest optical etc layout is preferable but the current schemes and materials seem suitable; if required, the slab ends etc can be Brewster cut etc. The pumping section can sport a MOPA configuration to eases this function exploiting coherence. The inner pressure can be relevat but affects mildly only the outer window. Compactness and more degrees of symmetry lead to a natural athermal behaviour; the inner structure includes gas ducts dedicated to equalize its temperature. The neuter, clean He sports a top C_P and flows easily; speed and pressure increase the heat removal rate and reduce dT; the fast cycle can be important. H₂ would spoil the HT / HR coatings and the electronics and generates water. Note that He was used to cool the largest AC generators. To improve the heat removal from hot spots or weak elements, a Thermo Electric cooler can yield local, sub-ambient temperature flows. A cycle including dedicated turbo stages, intercoolers and gas expansion suits larger critical sections.

Citation Download Citation

Maurizio Checchetti "High-power DPSS Laser hosted on a HMW-THS", Proc. SPIE 6451, Solid State Lasers XVI: Technology and Devices, 64511F (20 February 2007); https://doi.org/10.1117/12.705244

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KEYWORDS

Electronics

Mirrors

Semiconductor lasers

Collimation

Fluctuations and noise

High power lasers

Thermal effects

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